
This 0.5-3mm twist drill chuck set is made of copper with excellent workmanship. 14pcs Collet chuck set:2 set collet(0.5mm, 1.0mm, 1.5mm, 2.5mm, 3.0mm);2pcs Copper Drill File;2pcs Axle(2.35mm,3.17mm); 2pcs Hex Key Copper material can be stable and durable, good micro electric drill accessories The collets can be used with twist drill as a mini hand drill for ABS board, aluminum shet, cardboard drilling. For the small drill, and after connecting with the motor for circuit boards, drill to make a special mini drill